/*===========================================================================*\
*                                                                           *
*                               OpenMesh                                    *
*      Copyright (C) 2001-2005 by Computer Graphics Group, RWTH Aachen      *
*                           www.openmesh.org                                *
*                                                                           *
*---------------------------------------------------------------------------* 
*                                                                           *
*                                License                                    *
*                                                                           *
*  This library is free software; you can redistribute it and/or modify it  *
*  under the terms of the GNU Library General Public License as published   *
*  by the Free Software Foundation, version 2.                              *
*                                                                           *
*  This library is distributed in the hope that it will be useful, but      *
*  WITHOUT ANY WARRANTY; without even the implied warranty of               *
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU        *
*  Library General Public License for more details.                         *
*                                                                           *
*  You should have received a copy of the GNU Library General Public        *
*  License along with this library; if not, write to the Free Software      *
*  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                *
*                                                                           *
\*===========================================================================*/


//=============================================================================
//
//  Implements the baseclass for MeshWriter exporter modules
//
//=============================================================================


#ifndef __BASEEXPORTER_HH__
#define __BASEEXPORTER_HH__


//=== INCLUDES ================================================================


// STL
#include <vector>

// OpenMesh
#include <Core/System/config.hh>
#include <Core/Math/VectorT.hh>
#include <Core/Mesh/Kernels/Common/BaseKernel.hh>


//=== NAMESPACES ==============================================================


namespace OpenMesh {
	namespace IO {


		//=== EXPORTER ================================================================


		/**
		Base class for exporter modules.
		The exporter modules provide an interface between the writer modules and
		the target data structure. 
		*/

		class BaseExporter
		{
		public:

			virtual ~BaseExporter() { }


			// get vertex data
			virtual Vec3f  point(VertexHandle _vh)    const = 0;
			virtual Vec3f  normal(VertexHandle _vh)   const = 0;
			virtual Vec3uc color(VertexHandle _vh)    const = 0;
			virtual Vec2f  texcoord(VertexHandle _vh) const = 0;


			// get face data
			virtual unsigned int 
				get_vhandles(FaceHandle _fh, 
				std::vector<VertexHandle>& _vhandles) const=0;
			virtual Vec3f  normal(FaceHandle _fh)     const = 0;
			virtual Vec3uc color(FaceHandle _fh)      const = 0;


			// get reference to base kernel
			virtual const BaseKernel* kernel() { return 0; }


			// query number of faces, vertices, normals, texcoords
			virtual size_t n_vertices()   const = 0;
			virtual size_t n_faces()      const = 0;
			virtual size_t n_edges()      const = 0;


			// property information
			virtual bool is_triangle_mesh()     const { return false; }
			virtual bool has_vertex_normals()   const { return false; }
			virtual bool has_vertex_colors()    const { return false; }
			virtual bool has_vertex_texcoords() const { return false; }      
			virtual bool has_face_normals()     const { return false; }
			virtual bool has_face_colors()      const { return false; }
		};


		//=============================================================================
	} // namespace IO
} // namespace OpenMesh
//=============================================================================
#endif
//=============================================================================
